package org.myorg.kafka2mysql.demo.mysql;


import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
import org.myorg.kafka2mysql.demo.entitys.Student;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;

/**
 * 写入数据到 Mysql中
 */
public class SinkToMysql extends RichSinkFunction<Student> {
	private PreparedStatement ps;
	private Connection connection;

	/**
	 * open() 方法中建立连接，这样不用每次 invoke 的时候都要建立连接和释放连接
	 * @param parameters
	 * @throws Exception
	 */
	@Override
	public void open(Configuration parameters) throws Exception {
		super.open(parameters);
		connection = getConnection();
		String sql = "insert into student(id, name, password, age) values(?, ?, ?, ?);";
		ps = this.connection.prepareStatement(sql);
	}

	private Connection getConnection() {
		Connection conn = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection("jdbc:mysql://10.10.87.38:3306/crm?useUnicode=true&characterEncoding=UTF-8", "crm", "crm@2015");
		} catch (Exception e) {
			System.out.println("-----------mysql get connection has exception , msg = " + e.getMessage());
		}
		return conn;
	}

	@Override
	public void close() throws Exception {
		super.close();
		//关闭连接和释放资源
		if (connection != null) {
			connection.close();
		}
		if (ps != null) {
			ps.close();
		}
	}

	/**
	 * 每条数据的插入都要调用一次 invoke() 方法
	 *
	 * @param value
	 * @param context
	 * @throws Exception
	 */
	@Override
	public void invoke(Student value, Context context) throws Exception {
		ps.setInt(1, value.getId());
		ps.setString(2, value.getName());
		ps.setString(3, value.getPassword());
		ps.setInt(4, value.getAge());
		ps.executeUpdate();
	}
}
